So then what does it give you when you put a space between the link: and the URL? I get different results, more listings for one site, fewer for another. Strange. Glad that is the official one, though, since that is what is showing the most backlinks for my older site! For a minute there I thought my links had dropped from over 400 to about 40! Whew!
searches for "link" and "site.com", your not using the backlink utility in this case.. your just searching the web for those two terms ("www" is removed because it is very common, but the point is stated above)